After Applying the site Library customize page doesn't opened why?

Hi there,

what happens when you try opening the Customizer ?

If it is just a white screen then this is usually because your PHP Memory Limit needs increasing:

https://docs.generatepress.com/article/increasing-php-memory-limit/

Also after that, having problem with:

Fatal error: Allowed memory size of 41943040 bytes exhausted (tried to allocate 20480 bytes) in /home/n4mwru6fyela/public_html/blog/wp-includes/class-wp-customize-setting.php on line 163

Fatal error: Allowed memory size of 41943040 bytes exhausted (tried to allocate 20480 bytes) in /home/n4mwru6fyela/public_html/blog/wp-includes/functions.php on line 4306

You need to increase the PHP Memory limit as per the article i provided above:

https://docs.generatepress.com/article/increasing-php-memory-limit/

I did the same task as you given before or now. Its the same task. How can I do?

What did you increase the Memory Limit to?